Blower



July 17, 1928. 1,677,446

E. HARTMETZ BLOWER Filed May 12, 1927 di, :4", m v, I

Zn/en [01.-

Patented July .17, 1928.

UNITED STATES PATENT OFFICE.

BLOWER.

Application filed May 12, 1927, Serial No. 190,856, and in Germany May 17, 1926.

My invention relates to blowers, and more particularly to appliances by which a fiuld under pressure is projected onto a surface. It is an object of my invention to rovlde an appliance of the kind describe which requires only little power for its operation and prevents fatigue to the operator, and

in which the life of the control valve is much.

increased.

To this end, instead of the usual arrange- 'ment with the axis of the control valve to hold the valve on its seat, and, if desired,

a spring maybe provided for assisting this action.

By way of example I shall now describe a pneumatic appliance such as is' used in workshops, foundries and the like, for instance, for blowing chips or other foreign matter out of drilled or bored holes, or away from surfaces, for cleaning pattern plates, etc., but I am not limited to any particular application of my appliance nor to the use of any particular fluid under pressure. I

In the drawings affixed to this specification and forming part thereof an appliance embodying my invention is illustrated diagrammatically by way of example.

In the drawings Fig. 1 is an axial section of the appliance,

Fig. 2 is a partial section on the line II-II in Fig. 1,

Fig. 3 is an elevation, partly in section, of the control valve, on a larger scale, and

Fig. 4 is a section on the line IV-IV in F i 1, with the operating lever removed.

-%eferring now to the drawings, a is a tubular teat to which air under pressure is supplied by a flexible tube (not shown), 6

is the valve casing which is screwed on the front end of the teat a, c is a nozzle support which in turn is screwed on the front end of the valve casing, and p is a nozzle secured in the front end of the support. I

The control valve 6 is equipped with a valve spindle d secured in the valve body by means of it's threaded end, and a washed f which is held between a flange g of the valve spindle a? and is secured in the valve by a peripheral shoulder 72.. As will appear from Fig. 1, the valve and its spindle are arranged coaxially with the casing of the appliance so that erosion of the valve'face by the fluid under pressure, as with the usual transverse arrangement of the valve, is eliminated. It is not necessary though generally preferable that the valve be arranged coaxially, but it is important that it should be arranged longitudinally with respect to the casing of the appliance. The fluid in rushing past the valve tends to pull the washer out of the valve body but this tendency is overcome by the flange g and the shoulder 72..

The control valve cooperates with an a11- nular seat 70 in the valve casing b and is held onits seat by the joint action of a spring 71 and the fluid pressure from the teat a. The valve spindle d is free to slide in a bushing Z which projects from the rear end of the nozzle support 0. m is a parallel slot formed intermediate two partitions in the nozzle support 0 as will appear from Fig. 4;. A chamber 8 is formed intermediate the valve casing 72 and the'nozzle support 0, and connected with the valve seat A: by a passage 25 surrounding the bushing Z, and with the cavity at of the nozzle suppoit c by two passages 11, 0 which extend along the walls of the slot m on either side of the slot m, as shown in Fig. 4. o is apin extending through the slot m on which the valveoperating lever n is free to rock.

As will appear from Fig. 1, the lever is L-shaped and, with its rear face, engages the end of the valve spindle d so that when the end of the lever is depressed, the valve 0 will be lifted from. its seat It; and allow compressed air from the teat a to flow through the several passages as describedand to be finely discharged from a nozzle p at the front end of the support a. On account of the considerable leverage of the lever 02-. a

slight pressure on the lever will open the valve so that the operation of the appliance is not fatiguing. The head of a screw 7 forms a check for the downward motion of the lever n so that the maximum delivery of the valve is limited.

The nozzle p is screwed into the front end of the nozzle support 0 and a suspending hook q maybe inserted between the nozzle and the nozzle support, and clamped in any desired position.

I wish it to be understood "that I do not desire to be limited to the exact details of construction shown and described for obvious modifications will occur to a person skilled in the art.

I claim 1. A blower comprising a valve casing, means for supplying fluid under pressure to said casing, a nozzle support on said valve casing having a fluid passage way, a bushing projecting from the rear end of said support, a control valve in said valve casing, a spindle secured to said valve and carried in said bushing, said control valve being arranged longitudinally with respect to said blower and so as to be held on its seat by the pressure of the fluid, the body of said blower containing a slot, and an operating lever in contact with said spindle and arranged pivotally Within said slot.

2. A blower comprising a valve casing having a fluid passage way, means for supplying to said casing fluid under pressure, a nozzle support on said valve casing, a bushing projecting from the rear end of said support, a control valve in said valve casing, a spindle secured to said valve and guided in said bushing, said control valve being arranged longitudinally with respect to the blower and so as to be held on its seat by the pressure of the fluid, the body of said blower containing; a slot, a pin at one end of said slot, and an angular operating lever partly arranged within said slot in contact with said spindle and" fulcrumed on said pin, the end of the lever which projects from said slot being directed oppositely to the direction of flow of fluid in said blower.

In testimony whereofIaflix my signature.

ERNST HARTMETZU 

